88 CLASSIFICATION OF THE ALEYEODID^. 
the anal aperture and two spots near the anterior margin are always 
naked. There are fine rents in the waxy crust, which more or less 
define the limits of the segments. If the crust is removed, the 
puparium appears brown, fine grained, and of an irregular reticu- 
lated structure, which is caused by fine lines that are impressed on 
the body. The limits of the segments are distinguishable only along 
the middle of the dorsal side. The margin is crenulate. There are 
no long and robust bristles present. On the other hand, there is a 
great number of short fine hairs scattered over the whole surface of 
the dorsum. The anal aperture lies in a long, extended, almost tri- 
angular pit. The operculum is strongly arched and approximately 
rectangular. The lingula is scarcely visible, broadening out at the 
end, and provided with fine teeth. The long bristles which are char- 
acteristic of the various species of Aleurodidee are entirely wanting 
in this case. Length approximately 1.7 mm., width about 1.3 mm. 
I have found adult specimens of this insect at Slafringe in the 
Province of Ostergotland, Sweden (June 2, 1005). Puparia were 
very common on the 'laple leaves of the experimental field near 
Stockholm (Nov., 1906). 
Aleurochiton forbesii (Ashmead). 
(PI. XXXIII, figs. 1-9.) 
Aleurodes aceris Forbes, 14th Kept. 111. State Ent, p. 110 (1884) ; Bui. 45. 
U. S. Nat. Mus., p. 294 (1893). 
ORIGINAL DESCRIPTION. 
I have noticed for several years, a peculiar bark louse upon the leaves of 
the maple, but have not bred it until the present year. The fully developed 
pupal scale is oval in general outline, somewhat lyrate, broadest posteriorly, 
contracted in front of the middle. Margins entire, surface densely granu- 
lated. The color is chocolate, mottled with white, the white varying in amount 
and tending to form three transverse bands. The central segmented area is 
usually irregularly mottled with white, and a quadrate pal eh. Including the 
vent, is almost always brown; but, otherwise, the color may vary from nearly 
uniform brown to almost white. Outline sometimes slightly emarginate 
ii«'tly. Length, .095 of an inch; greatest width, .045: width at anterior 
fourth. .086. 
The Imago is pale yellow throughout; lej, r s and abdomen pale; wings milky 
white; rostrum black at the extreme Up; veins yellowish: firs! joinl of the 
antennae scarcely longer than wide, the remaining joints Aliform, the second 
nearly as long as the four following and about four times as Long SB the tirst. 
the fourth longer than the third, the third and fifth about equal, the sixth 
fusiform. 
At Tamaroa, Id southern Illinois, soft maple trees were found badly Infested 
by this hurl; louse, hut ds. -where it h:is occurred in only trivial numbers. There 
are apparently two broods of this species m a year, scales collected in August, 
188.'!, emerging April i<> to up iss-i, and others, collected during the present 
